Akhilesh,
I've been able to get your project to compile and work. In your project properties you have, "C:\ti\TivaWare_C_Series-2.0.1.11577\driverlib" in the include path but in your code, you have a #include "driverlib/gpio.h. I had to change it to #include "gpio.h" to get it to compile. I also commented out a bunch of the SysCtl API functions. SYS/BIOS handles most of this functions such as setting the CPU clock. Also, it's not recommended to use SysCtl API functions in a SYS/BIOS project, SYS/BIOS has it's own equivalent functions that you can use.
Another thing is I see your ledToggle function is called from the idle task and calling delay() from an idle task is not recommended. A better way would be to create an ledToggle task and use Task_sleep() to delay. You could also use the SYS/BIOS timer to achieve what you want to achieve.
Moses
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